RT Journal Article SR Electronic T1 Clinical usefulness of thallium-201 scintigraphy in the study of coronary artery disease: a comparison of two exercise systems JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 73 OP 78 VO 49 IS 2 A1 Underwood, Donald A. A1 Rincon, Gustavo A1 Yiannikas, John A1 Cook, Sebastian A. A1 MacIntyre, William J. A1 Go, Raymundo T. YR 1982 UL http://www.ccjm.org/content/49/2/73.abstract AB